Pyrrhotite - Wikipedia Pyrrhotite (pyrrhos in Greek meaning "flame-coloured") is an iron sulfide mineral with the formula Fe (1−x) S (x = 0 to 0 125) It is a nonstoichiometric variant of FeS, the mineral known as troilite Pyrrhotite is also called magnetic pyrite, because the color is similar to pyrite and it is weakly magnetic
Pyrrhotite and Crumbling Concrete - CT. gov Pyrrhotite weathering in the presence of moisture and air produces secondary minerals that expand, causing concrete to crack This compromises the structural integrity and accelerates degradation with the increased infiltration of water and air
USGS Publishes Map of Potential Pyrrhotite Occurrences Pyrrhotite, a mineral of concern for the construction industry, consists of iron and sulfur, and when exposed to water and air, it can break down to form secondary minerals that expand and crack concrete, causing concrete structures, like home foundations, to fail
Pyrrhotite: Mineral information, data and localities. - mindat. org Pyrrhotite is found with pentlandite in basic igneous rocks, veins, and metamorphic rocks It is also often found with pyrite, marcasite, and magnetite It has varying magnetic powers, depending on the number of Fe vacancies in the crystal structure
Pyrrhotite: Physical properties, uses, composition - Geology. com Pyrrhotite is an iron sulfide mineral found in igneous and metamorphic rocks Its chemical formula of Fe (1-x) S indicates that it is deficient in iron - which causes pyrrhotite to be slightly to strongly magnetic After magnetite, pyrrhotite is the second-most-common magnetic mineral What Is Pyrrhotite?
UNDERSTANDING PYRRHOTITE IN CONCRETE Pyrrhotite is the suspected cause of concrete durability issues found in the northeast U S (Conn ), primarily used for residential foundations The foundations of interest are experiencing a slow crack development, resulting in the eventual loss of concrete strength
The Mineral pyrrhotite - The Mineral and Gemstone Kingdom Pyrrhotite is an ore of iron Well crystallized Pyrrhotite specimens are important collectors minerals The aesthetic prismatic crystal forms are especially treasured by collectors and in high demand
PYRRHOTITE (Iron Sulfide) - Amethyst Galleries The bulk of this specimen is made up of several crystals of Pyrrhotite, the iron sulfide known for its slight magnetism The crystals have the classic brown-gold color, submetallic luster, and platy, hexagonal shape with basal terminations that Pyrrhotite so often has